A(n)________ is a rule that states that either each foreign key value must match a primary key value in another relation or the foreign key value must be null.

Name: A(n)________ is a rule that states that either each foreign key value must match a primary key value in another relation or the foreign key value must be null.
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The Answer of A(n)________ is a rule that states that either each foreign key value must match a primary key value in another relation or the foreign key value must be null.

A(n)________ Is a Rule That States That Either Each Foreign